Instrumenting subsequent calls

hiphop/service.py

 from flask import Flask, redirect
 from jaeger_client import Config
-from flask_opentracing import FlaskTracing
+from flask_opentracing import FlaskTracing, FlaskTracer
 import opentracing
 import requests
 import traceback 
 import os
 
 # A very boring and basic hip-hop-service to demonstrate 
-# observalability and tracing.
+# observability via tracing.
 
 service = os.environ.get('HIPHOP', 'hiphop')
 tier = int(os.environ.get('TIER', '1'))
 app = Flask(__name__)
 
-print("Hello World")
-
 config = Config(config = {
     'sampler': { 
         'type': 'const', 
@@ -35,11 +33,12 @@ def index():
 def hip():
     r = ""
     try:
-        current_span = tracing.get_span(request)
-        text_carrier = {}
-        tracing.inject(span, opentracing.Format.TEXT_MAP, text_carrier)
-        print(text_carrier)
-        r = requests.get(f"http://{service}-{tier + 1}", headers=text_carrier, allow_redirects=True)
+        parent_span = flask_tracer.get_span()
+        with opentracing.tracer.start_span(f"{service}-{tier + 1}", child_of=parent_span) as span:
+            url = f"http://{service}-{tier + 1}"
+            span.set_tag("http.url", url)
+            r = requests.get(url)
+            span.set_tag("http.status_code", r.status_code)
         print(r)
         r = r.content.decode('utf-8')
     except Exception as ex: